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Move and Exchange Instructions

Move and Exchange Instructions. Module M16.1 Section 10.2. MOV Move Instruction. Can move immediate data to a register or memory (but not a segment register). Can move data from a register to a register. Can move data from a register to memory. Can move data from memory to a register.

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Move and Exchange Instructions

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  1. Move and ExchangeInstructions Module M16.1 Section 10.2

  2. MOV Move Instruction • Can move immediate data to a register or memory (but not a segment register). • Can move data from a register to a register. • Can move data from a register to memory. • Can move data from memory to a register. • Can NOT use MOV instruction to move data directly from one memory location to another. But can use MOVS instruction.

  3. Some MOV Instructions

  4. 8 9 A B C D E F OR b OR w OR b OR w OR b OR w PUSH 0 AL,imm AX,imm r/m,reg r/m,reg reg,r/m CS reg,r/m POP PUSH SBB b SBB w SBB b SBB w SBB b SBB w 1 DS DS AL,imm AX,imm reg,r/m r/m,reg reg,r/m r/m,reg SUB w SUB b SUB w SUB b SUB b SUB w SEGMENT DAS 2 AL,imm AX,imm reg,r/m reg,r/m CS r/m,reg r/m,reg CMP b CMP w CMP b CMP w CMP b CMP w SEGMENT AAS 3 AL,imm AX,imm reg,r/m r/m,reg DS r/m,reg reg,r/m DEC DEC DEC DEC DEC DEC DEC DEC 4 DX BX SP BP SI DI AX CX POP POP POP POP POP POP POP POP 5 AX CX DX BX SP BP SI DI 6 7 JS JNS JNLE/JG JP/JPE JNP/JPO JL/JNGE JNL/JGE JLE/JNG POP MOV b MOV LEA MOV MOV W MOV b MOV W 8 r/m r/m,reg r/m,seg reg,r/m seg,r/m r/m,reg reg,r/m reg,r/m CALL CBW SAHF LAHF CWD PUSHF POPF WAIT 9 inter TEST b TEST w SCAS w STOS b STOS w LODS b LODS w SCAS b A AL,imm AL,imm MOV MOV MOV MOV MOV MOV MOV MOV B AX,imm CX,imm DX,imm BX,imm SP,imm BP,imm SI,imm DI,imm RET INT RET INT INTO IRET C inter+ type inter ESC ESC ESC ESC ESC ESC ESC ESC D 0 1 2 3 4 5 6 7 CALL JMP JMP JMP IN b IN w OUT b OUT w E intra intra inter short AL,DX AX,DX DX,AL DX,AX CLC CLD STC CLI STI STD * * F Table A2.a Opcode Map mov bx,ax 8B D8

  5. Table A.3 Table A.4 Fields mod,r/m Postbyte Postbyte Field reg mod = 11 reg byte (b) word (w) 000 AL AX r/m byte word mod = 00 mod = 01 mod = 10 001 CL CX 000 AL AX BX + SI BX + SI + disp8 BX + SI + disp16 001 CL CX BX + DI BX + DI + disp8 BX + DI + disp16 010 DL DX 010 DL DX BP + SI BP + SI + disp8 BP + SI + disp16 011 BL BX 011 BL BX BP + DI BP + DI + disp8 BP + DI + disp16 100 AH SP 100 AH SP SI SI + disp8 SI + disp16 101 CH BP 101 CH BP DI DI + disp8 DI + disp16 110 DH SI 110 DH SI Direct BP + disp8 BP + disp16 111 BH DI 111 BH DI BX BX + disp8 BX + disp16 Postbyte 1 1 0 1 1 0 0 0 = D8 mod reg r/m mov bx,ax 8B D8 mov bx,ax 8B mov w reg,r/m reg = bx = 011 mod = 11 r/m = ax = 0 0 0

  6. 8 9 A B C D E F OR b OR w OR b OR w OR b OR w PUSH 0 AL,imm AX,imm r/m,reg r/m,reg reg,r/m CS reg,r/m POP PUSH SBB b SBB w SBB b SBB w SBB b SBB w 1 DS DS AL,imm AX,imm reg,r/m r/m,reg reg,r/m r/m,reg SUB w SUB b SUB w SUB b SUB b SUB w SEGMENT DAS 2 AL,imm AX,imm reg,r/m reg,r/m CS r/m,reg r/m,reg CMP b CMP w CMP b CMP w CMP b CMP w SEGMENT AAS 3 AL,imm AX,imm reg,r/m r/m,reg DS r/m,reg reg,r/m DEC DEC DEC DEC DEC DEC DEC DEC 4 DX BX SP BP SI DI AX CX POP POP POP POP POP POP POP POP 5 AX CX DX BX SP BP SI DI 6 7 JS JNS JNLE/JG JP/JPE JNP/JPO JL/JNGE JNL/JGE JLE/JNG POP MOV b MOV LEA MOV MOV W MOV b MOV W 8 r/m r/m,reg r/m,seg reg,r/m seg,r/m r/m,reg reg,r/m reg,r/m CALL mov bx,ax CBW SAHF LAHF CWD PUSHF POPF WAIT 9 inter TEST b TEST w SCAS w STOS b STOS w LODS b LODS w SCAS b A AL,imm AL,imm 89 C3 MOV MOV MOV MOV MOV MOV MOV MOV B AX,imm CX,imm DX,imm BX,imm SP,imm BP,imm SI,imm DI,imm RET INT RET INT INTO IRET C inter+ type inter ESC ESC ESC ESC ESC ESC ESC ESC D 0 1 2 3 4 5 6 7 CALL JMP JMP JMP IN b IN w OUT b OUT w E intra intra inter short AL,DX AX,DX DX,AL DX,AX CLC CLD STC CLI STI STD * * F Table A2.a Opcode Map mov bx,ax 8B D8

  7. Table A.3 Table A.4 Fields mod,r/m Postbyte Postbyte Field reg mod = 11 reg byte (b) word (w) 000 AL AX r/m byte word mod = 00 mod = 01 mod = 10 001 CL CX 000 AL AX BX + SI BX + SI + disp8 BX + SI + disp16 001 CL CX BX + DI BX + DI + disp8 BX + DI + disp16 010 DL DX 010 DL DX BP + SI BP + SI + disp8 BP + SI + disp16 011 BL BX 011 BL BX BP + DI BP + DI + disp8 BP + DI + disp16 100 AH SP 100 AH SP SI SI + disp8 SI + disp16 101 CH BP 101 CH BP DI DI + disp8 DI + disp16 110 DH SI 110 DH SI Direct BP + disp8 BP + disp16 111 BH DI 111 BH DI BX BX + disp8 BX + disp16 Postbyte 1 1 0 0 0 0 1 1 = C3 mod reg r/m mov bx,ax 89 C3 mov bx,ax 89 mov w r/m, reg reg = ax = 000 mod = 11 r/m = bx = 0 11

  8. Table A.3 Table A.4 Fields mod,r/m Postbyte Postbyte Field reg mod = 11 reg byte (b) word (w) 000 AL AX r/m byte word mod = 00 mod = 01 mod = 10 001 CL CX 000 AL AX BX + SI BX + SI + disp8 BX + SI + disp16 001 CL CX BX + DI BX + DI + disp8 BX + DI + disp16 010 DL DX 010 DL DX BP + SI BP + SI + disp8 BP + SI + disp16 011 BL BX 011 BL BX BP + DI BP + DI + disp8 BP + DI + disp16 100 AH SP 100 AH SP SI SI + disp8 SI + disp16 101 CH BP 101 CH BP DI DI + disp8 DI + disp16 110 DH SI 110 DH SI Direct BP + disp8 BP + disp16 111 BH DI 111 BH DI BX BX + disp8 BX + disp16 Postbyte = 1C 0 0 0 1 1 1 0 0 mod reg r/m Move byte pointed to by si into BL mov bl,[si] 8A 1C mov bl,[si] 8A mov b reg, r/m reg = bl = 011 mod = 00 r/m = si = 100

  9. XCHG Exchange Instruction • Can exchange AX with a 16-bit register. • Can exchange an 8-bit register with another 8-bit register or an 8-bit byte in memory. • Can exchange a 16-bit register with another 16-bit register or a 16-bit word in memory.

  10. XCHG Instruction Machine Assembly Language Code Instruction Operation 9X XCHG reg16 Exchange AX and reg16 86 PB XCHG b r/m,reg Exchange r/m and reg bytes 87 PB XCHG w r/m,reg Exchange r/m and reg words

  11. 0 1 2 3 4 5 6 7 ADD b PUSH POP ADD w ADD b ADD w ADD b ADD w 0 ES r/m,reg ES r/m,reg AL,imm AX,imm reg,r/m reg,r/m ADC b ADC b ADC w ADC w ADC b ADC w PUSH POP 1 reg,r/m r/m,reg reg,r/m AL,imm AX,imm r/m,reg SS SS AND b AND w AND b AND w AND b AND w SEGMENT DAA 2 reg,r/m reg,r/m AL,imm AX,imm r/m,reg r/m,reg ES XOR b XOR w XOR b XOR w XOR b XOR w SEGMENT AAA 3 reg,r/m r/m,reg r/m,reg reg,r/m AL,imm AX,imm SS INC INC INC INC INC INC INC INC 4 DX BX SP SI DI AX CX BP PUSH PUSH PUSH PUSH PUSH PUSH PUSH PUSH 5 AX SI DI CX DX BX SP BP 6 JO JNO JB/JNAE JNB/JAE JE/JZ JNE/JNZ JNBE/JA JBE/JNA 7 JC JNC XCHG w TEST b TEST w XCHG b 8 * * * * r/m,reg r/m,reg r/m,reg r/m,reg XCHG XCHG XCHG XCHG XCHG XCHG XCHG NOP 9 CX,AX DX,AX BX,AX SP,AX BP,AX SI,AX DI,AX MOV b MOV w MOV b MOV w MOVS b MOVS w CMPS b CMPS w A AL,mem AX,mem mem,AL mem,AX MOV MOV MOV MOV MOV MOV MOV MOV B AL,imm CL,imm DL,imm BL,imm AH,imm CH,imm DH,imm BH,imm RET LES LDS RET MOV b MOV w C reg.r/m intra+ reg.r/m intra r/m,imm r/m,imm XLAT * AAD * * * AAM D LOOPZ/ LOOP OUT b OUT w LOOPNZ/ JCXZ IN b IN w E LOOPE port,AL port,AX LOOPNE AL,port AX,port REP/REPNE REPE/ * LOCK HLT CMC * F REPNZ REPZ Table A2.a Opcode Map

  12. Table A.3 Table A.4 Fields mod,r/m Postbyte Postbyte Field reg mod = 11 reg byte (b) word (w) 000 AL AX r/m byte word mod = 00 mod = 01 mod = 10 001 CL CX 000 AL AX BX + SI BX + SI + disp8 BX + SI + disp16 001 CL CX BX + DI BX + DI + disp8 BX + DI + disp16 010 DL DX 010 DL DX BP + SI BP + SI + disp8 BP + SI + disp16 011 BL BX 011 BL BX BP + DI BP + DI + disp8 BP + DI + disp16 100 AH SP 100 AH SP SI SI + disp8 SI + disp16 101 CH BP 101 CH BP DI DI + disp8 DI + disp16 110 DH SI 110 DH SI Direct BP + disp8 BP + disp16 111 BH DI 111 BH DI BX BX + disp8 BX + disp16 Postbyte 1 1 0 0 0 1 1 1 = C7 mod reg r/m xchg bh,al 86 C7 xchg bh,al 86 xchg b r/m,reg reg = al = 000 mod = 11 r/m = bh = 111

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